James F. Watson

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The amount of posterior tooth visibility was analyzed in a population of 425 subjects. By scoring photographic data, the percentage of posterior teeth that could have a crown margin placed in their occlusal, middle, and gingival sections without showing were calculated. The results of this study indicate that: 1. For esthetic reasons, posterior margin(More)
DUARTE, CRISTOBAL G., AND JOHN F. WATSON. Calcium reabsorption in proximal tubule of the dog nephron. Am. J. Physiol. 212(6): 1355-1360. Ig67.This experiment was performed to study the reabsorption of calcium in the dog proximal tubule and further evaluate the relationship between sodium and calcium transport. A microadaptation of a fluorometric method was(More)
The purpose of this study were to determine the acceptability of silver-plated dies made from representative brands of impression material from each of the four groups of elastomers and to determine the time required for initial plating of dies. Permlastic and Impregum , each previously shown to produce consistent silver-plated dies, were used for(More)
Attitudes of 396 subjects were surveyed concerning crown margin placement, and 112 dentists were surveyed regarding their treatment approach in respect to crown margin placement. The results of this study indicate that: 1. Routine subgingival margin placement of esthetic crowns may overtreat many patients. 2. Routine subgingival margin placement of esthetic(More)
This laboratory study simulated actual clinical crown fabrication. Crowns were finished to the point of clinical delivery with stone and silver-plated dies made from representatives of the four major groups of elastomers. A clinically acceptable technique for judging crown margin accuracy was used, and numerical scores were assessed. Scores were analyzed(More)
A number of investigators (1-9) have recently studied the potassium concentration in the proximal tubule of rat and Necturus. Unfortunately, there are significant differences in the results obtained by different observers. The general conclusion, however, that potassium is reabsorbed against an electrochemical gradient in the proximal tubule of the rat(More)